*** A man was arrested for beating a worker with a metal pole in an East Flatbush coin laundry, authorities said yesterday.

The incident began at 1:40 a.m. Monday, when a 60-year-old male attendant became suspicious that Derek Gibbs, 42, was spending between 15 to 30 minutes in a bathroom at the Ralph Avenue laundry, police sources said.

Dilbert then allegedly slugged the woman in the eye, knocking her to the ground.

He then took $300 from her purse before fleeing, sources said.

The victim was being treated for fractures to her face, broken teeth and nerve damage to her jaw.

*** The death of a man found in his car in Bath Beach with a gunshot wound has been declared a suicide, the Medical Examiner’s Office said yesterday.

Police received a 911 call of a man slumped over the wheel in his car parked at 20th Drive and 20th Avenue about 9:30 p.m. Monday. Arriving cops found Sky Hei Man Choi, 30, with a gunshot wound to the chest.

Choi was rushed to the hospital, where he was pronounced dead.

MANHATTAN

*** A 59-year-old man was killed yesterday after stepping off a crowded subway platform in front of a subway train.

Police said the man, whose identity was not immediately known, was struck and killed at about 5:30 p.m. in the northbound tunnel of the No. 6 train at Canal Street. Authorities described the death as an apparent suicide.

*** A quick-thinking rookie cop yesterday helped nab a suspected bank robber less than 30 minutes after a heist in the East Village.

Two-year officer James Mahoney of the 9th Precinct apprehended Woody Davis, 24, of Morningside Heights at 2 p.m., just after the suspect robbed a Bank of America branch on Second Avenue, police said.

A man dressed in a checkered hat and dark jacket had told a teller he had a gun, passed a note demanding money and fled with cash, police said.

Christopher Meyers, a 33-year-old intern at Beth Israel Hospital, apparently jumped from the ninth floor of the high-rise at 353 E. 17th St. about 10:15 p.m. Monday and landed on the roof of an adjacent building, police sources said.

Some time before, Meyers became upset after getting into an argument with his girlfriend, sources said.

STATEN ISLAND

*** A man was arrested for beating his live-in girlfriend with a bottle in St. George in December, according to a criminal complaint.

Nicholas Korchow, 47, smashed his gal pal in the face with the bottle in their home at Belmont Place and Wall Street about 10:30 p.m. on Dec. 24, the complaint said.

The victim, whose name and age were not released, suffered cuts to her face and needed five stitches to close her wounds.

*** A man was arrested for choking his ex-girlfriend in her St. George home, according to a criminal complaint.

Arthur Landy, 35, allegedly grabbed and squeezed the woman’s neck while shoving her against a wall in her residence at St. Marks Place near Nicholas Street about 8 p.m. on Jan. 16, the complaint said.

The victim, whose name and age were not released, suffered cuts to her neck.